97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
#include "DAC8568.h"
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#include "stm32f4xx_hal.h" // 添加HAL库头文件
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#include "main.h"
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#include "user_spi.h"
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#include <stdint.h> // 添加标准整型定义
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#define DAC_MAX_VALUE 65535
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/**
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* @brief DAC8568通用写函数
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* @param cmd 命令类型：0-初始化内部参考电压，1-写入并更新DAC值
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* @param channel 通道号(0-7)，仅在cmd=1时有效
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* @param value DAC值(0-65535)或命令值，根据cmd决定
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* @return void
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*/
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void DAC8568_Write(uint8_t cmd, uint8_t channel, uint32_t value)
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{
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uint8_t tx_data[4];
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uint8_t rx_data[4] = {0}; // Initialize receive buffer
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uint32_t send_data;
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// 根据命令类型准备发送数据
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if(cmd == 0) // 初始化内部参考电压
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{
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send_data = DAC8568_EN_INTER_REF_STATIC;
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}
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else // 写入并更新DAC值
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{
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// 输入参数合法性检查
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if(channel > 7)
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{
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channel = 7;
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}
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if(value > DAC_MAX_VALUE)
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{
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value = DAC_MAX_VALUE;
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}
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send_data = DAC8568_WRITE_UPDATE_SEL_DAC;
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send_data |= (channel << 20);
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send_data |= (value << 4);
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}
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// 准备发送数据
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tx_data[0] = (uint8_t)(send_data >> 24);
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tx_data[1] = (uint8_t)(send_data >> 16);
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tx_data[2] = (uint8_t)(send_data >> 8);
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tx_data[3] = (uint8_t)(send_data & 0xFF);
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// 开始SPI传输
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DAC8568_CS_L; // 拉低CS，使能SPI接口
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extern SPI_HandleTypeDef hspi3; // 声明外部SPI句柄
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spi_transmit_receive(&hspi3, tx_data, rx_data, 4); // 使用hspi3发送4字节数据
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DAC8568_CS_H; // 拉高CS，禁止SPI接口
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}
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/**
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* @brief 初始化DAC8568芯片
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* @return void
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*/
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void DAC8568_Init(void)
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{
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//初始化GPIO和SPI
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dac8568_spi_init();
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// 将LDAC置低，DAC8568处于同步模式
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DAC8568_LD_L;
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// 初始化内部参考电压
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DAC8568_Write(0, 0, 0);
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}
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/**
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* @brief 设置DAC8568指定通道的电压值
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* @param mCh 通道号(0-7)
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* @param mVol 电压值(0-2.5V)
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* @return void
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*/
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void dac8568_set_voltage(unsigned char mCh, float mVol)
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{
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float mDatafloat;
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uint16_t mDtashort;
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// 将电压值转换为DAC值
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mDatafloat = mVol * (65536/(5*1.91));
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mDtashort = (uint16_t)mDatafloat;
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mDtashort &= 0xffff;
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// 限制DAC值范围
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if(mDtashort > 65535)
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mDtashort = 65535;
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// 写入并更新DAC值
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DAC8568_Write(1, mCh, mDtashort);
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}
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